The Sun Is as Warm as Ever

Chen's beloved son returns to Wutong, which involves a series of past events. In the winter, the sun shines faintly in the library, and a woman sits quietly in the corner looking at the book in her hand. The title of the book has four big words written in it, the sun is as warm as ever. Can the sun really be as warm as in previous years? There is a city in my heart, but there is only one person living in it.